Yes, same problem when using the IIsi ROM. But again, I am doing the test with a TS Adapter. I am not able to test the IIsi ROM with the IIsi adapter because I sold the IIsi adapter a couple years ago.
So Tyler's test confirms the problem! Yeah! Not only confirms it, but also confirms it on EXTERNAL drives too -- I only confirmed it on the INTERNAL floppy drive. So Tyler's test in combination with mine shows that neither the IIsi nor the IIfx ROM is compatible (IIfx ROM having been tested with the IIsi adapter in Tyler's SE/30, and both ROMs having been tested with the TS Adapter in my SE/30).
Tyler also mentioned his RAM, OS and Ethernet configuration. But I tested with many different RAM sizes, different RAM chips (sometimes filling all slots, sometimes only one bank, etc.), OS's from 6.0.8 through 8.1, with and without the MacCon attached. The same 1.4MB read/write problem occurs regardless of RAM, OS, and Ethernet configuration.
It also occurs regardless of the INITs, including the Daystar QuadControl CP used with the Turbo 040. Yes, I tested with it and without. And when I had the CP running, I changed various cache settings -- every combination I could think of. Nothing worked to solve the 1.4MB floppy problem EXCEPT putting the stock SE/30 ROM back into the SE/30.
I actually wrote extensively about all my various tests on this site, prior to the hard drive crash a year ago. All those hours of typing in my detailed reports vanished when that crash occurred. Here are the only older threads still in existence on this subject: Thread#1 & Thread#2.
Prior to the crash, the threads containing my posts were found at the following URLs:
http://www.68kmla.org/viewtopic.php?p=34873#34873
http://www.68kmla.org/viewtopic.php?p=48778#48778
http://www.68kmla.org/viewtopic.php?p=53786#53786
http://www.68kmla.org/viewtopic.php?p=53921#53921
But even Google doesn't have that info caches anymore.
I've discussed this in the past a bit in this AppleFritter thread. But that thread mainly talks about on screen artifacts and vertical bars. It does have some photos of interest for you though.
I've always wondered why he fell off the face of the planet, but perhaps he literally is no longer with us on this earth?
One last note...
Back in December 2005, Tyler and I exchanged some emails about the .SONY driver and a ROM patch Tyler put together for me. Looking through our old emails, I see that we played with this in a resource editor for a number of days, but ultimately the patch didn't work. :'(
So perhaps if anything needs to be patched, it would appear to be the ROM code of the Turbo 040, which for whatever reason is incompatible with IIfx and IIsi ROMs when used in the SE/30.